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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '187b1dd958491d3686c1c4815de9dfea6c93970d7a9190da1999f441a2136cd7' 
  AND token = 'Wp10U68nYrq98YjFb93yEoKM3zmIAvjsjwkoMmGlWSI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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