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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0182d180bffbaaa26218b47f400e5ecc718735a2636df9a44c0b021840e01eb' 
  AND token = 'dTs7gW0RsF+YzC0CPv+SNiU5Sy/cYJkBaxezxaLJ2IQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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