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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39c2008d4ed82a8d4bcd31183be539c95ed23f8e811c3de0224e9969b79f1953' 
  AND token = 'MHzryfKOE6s88GSKPy1jGxFBqYEucV1LlXrqIwYIn/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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