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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b1a0bea62bee1f14d5b6a979c994df9e7f697b2becc2e712a941565feb63989' 
  AND token = 'wc+xvM8t4sE1tB9OmSClLhwJjSnjt+ioVvtV7Pd+s+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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