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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52671cede70cc2c92c7f2e1736eb785afd2ec4f1c53d7892790ae1a080d20088' 
  AND token = 'ELKNWZhtudbjLYgfYuoUZDbZzqhv3FHYtdu/mv83pjo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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