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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2bb9c8bc84fbc55bef847e5e88c37ca413df1f39e858bfdea4bc4a2da1271d8' 
  AND token = 'JZ55M4pMDDvDgFFLru23PceUMrQcvvsC30hvwp7BYJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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