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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4666ee02e05b31abd56506fe4ab2c8721b9327896be7517796dd86ac85a29fb1' 
  AND token = 'ADfund8TiC7zWlV6GRRhreqwj2WGsDDtCfv/TKl7isk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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