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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a902ec94f7d5d7ec63eabdf79d93a62c39645c17264329042648b16ca18e9ad' 
  AND token = 'eLtT5wXqlyKf1MUGZGbAIxZ94toBQ1u91Uw9zHKf8/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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