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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e192b1f73d34f2219cd97586ba77a0807dbd9949268f1dd52ea94ae3e112fed5' 
  AND token = 'tclg2NSBusJkQ/BQUQNZIShHzkih8uakONhJC6UYH18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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