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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe1c2fb30a1ffdfcb1f4551f915f2875592fc1623a1712415d01dbcfdcb14097' 
  AND token = '0A6iK8gudV9RGqlLvl/EBaoKpue9wVviTB/GfXRk2/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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