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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10e7c2e091e43a5586635c9a38fedfed5564145b7e4424806bfb0c4a5c108d1b' 
  AND token = 'UU/K1p4vkl8NyyExez9xmBLfsUF7YgzuM0K0aHuQXU4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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