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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26eee682123ecbd0cfb83ad137f5c7838d398cda5ef0b7c93dba31a6543b6660' 
  AND token = '7REicTcCo4izLm5RLSNXv4IU1rsIJ+gb8zpbtkKv774=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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