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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84fae306a3c67842faebea58b86f1a8f8110c3ef5218d86d068901abfed6974f' 
  AND token = 'j/82M1k3eIjYUsCjHorZO6ge0tms2+h0IklDwfRrERo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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