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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee285af8df268cd74d949e123fd404df715984e310c55f508abe515a7d90d173' 
  AND token = '5B005l0L70haGezAmpbySigQE8n9Q6om4uafCExRVOw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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