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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc29db412e1becd47cccba5e52eb66237452d93fabfacded8d217ee4657161d1' 
  AND token = 'VG/Fzy3l5tZysW45yPqstPCFHnKWqQ4/KX/R7O80Pao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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