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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ece2dccef0a34794c7efbb376339fdbdfac1e6b53557cceac76d65195f550f3' 
  AND token = '7M3XTMHkZr029ooIQJYiCua1GLW8jeBpbvM//FP9q0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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