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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6474d483d3bbd54115b6d9b4ae4204287294edc08352ff86d0a41a91ff214430' 
  AND token = 'CZsknM4AL0yqIzMUfnd74PPKsiISpCiFPvCTWJD2GLI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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