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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78476c5fd47c8e7451a047adcb8aa4a824fae68970c84fbd3abd07301942febf' 
  AND token = 'diCGsONBu5dZL0nR4RhOvU+GzDD6RF7+T/8keek2jYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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