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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8aca6f5365ab7088c4a6e55a8f0968e1f4071753bebd03c989756c97a6df4776' 
  AND token = 'wMBNby7yqUuvKkte2p79LJl8571adwkKCNuzHkr/vKM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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