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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09a864dbe1160b324c9c891d3f8126d79c1182fe7e03798d3f2529de41620dbd' 
  AND token = 'A8D6FJ9ZfshuvNWhL+fe3AhcWawVdnodrowiowCkSCc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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