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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab8d3083e69e5c7332cc4cef1357c6a057bd060ba62a82a31de4cb2af88451a5' 
  AND token = 'dPiHwipsz+6wLphr7mDpCluc5m19O8M7Fp0Y6oFPHlU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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