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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8276f54e047e6e0d5931790a3682172bc63af0c949b7c9ab8b9243e89548055' 
  AND token = 'j0FGvSvbXgvoBNH6G/73NBneFT/YYrw7HLJb15TX/2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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