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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e71b70c25a2dc08a891aead937530d10174ff68f1737b52e26ad75b61eecc87e' 
  AND token = 'mvC+L4f+so6unnwTw8MZfcdThj6Ha14+KIKLRaLhbSo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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