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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adccacee37c6ebc0f13d3f30cb8195921f7472cb48e3b155992fe24a0302ce8b' 
  AND token = 'kKRUswIqrZqPhVApdT8SDrK+0AJEi3DhVNPDG3Qmb0Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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