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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee1bc2966768cdd702b8a6a336f9b7f676c1e1e2029e74f49368ddddc1d597e1' 
  AND token = '1SgVOO/W6sQ4WRbj0Jd0GNZ/PIUnsjtGARgF5YjNslU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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