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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c0821df8442224389cbf7c9b6d4332cb4fe3a65c1bbf07952ee5233fea2b5ce' 
  AND token = 'eEm4FIfeKe0dTy8xzEabRd4/BTPc84kJ9YviDLDNsG4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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