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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d90c5fce6b3b73b819073c451c7c0b83002a1918e9d82379e6c35d8c22b33e6' 
  AND token = 'AT5HfD0ZYOYc7ky2CdykIRObYjprR5XFMT6x3y7d32k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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