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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4b4965f7c048881436da04768f4ea98ab8bef294ef139bef72037c32de84896' 
  AND token = 'FPUzISHGDka8vOL5pUvDb+VQsfQ+DA/ISumsN9EsR9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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