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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcacffbf0c7b26ec629339a645d9f9a10329b0bf506b33e2109984000a78f17e' 
  AND token = 'fxs3tPpLWXCarVPADWzYfqre+I+bLy+pmEhK8SpQvG4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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