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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '893f7c1e4505395bfa9ed61f30ce873c1e5046fb522b7ef552863d98c978e077' 
  AND token = 'Nc2V9ENqNCoECSfnclU1xjCmTm4mCkAJeMdfxJJUjNE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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