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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f38bce583e4a5ac8a80dfc5e81239315c345ec6fd3eb35358e90370c52cdddaf' 
  AND token = 'ZR6XSRjQYBl4bZ/H+/1Yn6ckU2Fe/DiSKPp7pBAaViI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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