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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4eea27bc795b634382b2c1e5e6f0bbaf9594e21c36fc565a1972bd1ea60527c6' 
  AND token = 'HfY1iypZFheZZJU1RY3baI7vsomoHTNIZucalbIhhPU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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