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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2f6c9b984c6e2ff0aa1b2ab34884cdd2f3e502b0ee5449ee1c4bbfa2f61a6c7' 
  AND token = 'YbMZLuGGsdy5e06lpvxNcAWf/nYqD1ytj3aCcyPjDdo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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