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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef471875c813bb9e2be2d36c62312950dc3e9de78fafc14e59d50fc7a1d4c383' 
  AND token = 'JJw28vRRdQ8+n75hYg1i5TrNRt3F9IZyH324hG9z7LQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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