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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed60ae7157af37fcbdbca7bc7db27edf03bfb080011029536063f31424edc4df' 
  AND token = '9sKIjJiyxiXJdi95imyTwvZ456plO7h0cB1o7JgSi5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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