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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b657cd289840bfc7fe299ce854d0c3ccc02a04d6d4f13446b4a2706c14101b31' 
  AND token = 'iLhsR0fJ7kpd1fSDdX66j+NBOJY8eewobZ+dD2aGLb4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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