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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc3c680b4bb614f6dba0d8362aeff006b4a6cb853b597a64ab60ca0bfa599537' 
  AND token = '4Rv6hkiq853NffPiU8aX4yChBjNcdE9+iVp5Oo2mFfo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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