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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bac67012fb8b9618c4a63955f1929dcf34ff367bf4f8184615cd46e64a181eaf' 
  AND token = 'H/78mTK7wa8zOEVpbB0aO3KYaDZDHeG2i00/5Fx25KE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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