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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd7732d14e77659abc12c6b95d24e8bfa834690d4ae33f690e63a5c164878413' 
  AND token = 'yo3WPU4EzjOdLS4X1hcoZaosggxs+sntC735YaCUO0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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