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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9a3c51a0ce1edc91f67ae216655628a313df4b024f841ff8b5eb30746adeb12' 
  AND token = 'KdYxCXZ42HRHvcemFO/MmV4aeROZx5KGQcHiMm5bpIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}