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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b99639d17b61fdb0436b40a0be9e1ef4564b4b4d18eac93c1f4061e6c5b96f69' 
  AND token = '3abBJgMV7OrzrFoTvqSMy3uoyFO3gPUnDcTP9tEuMeo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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