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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e9871a898879d6fad16d866644ba20269fef1849c305ef1de3a0b2f265ff8e7' 
  AND token = 't0QPgSp082ifYpo2BBt6WEyNL28o29n4DNDtRHd3wrg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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