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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e7206bd02cb05909ff12031ac6d75024c6d5194a737a989fc7a6881a4139b58' 
  AND token = 'HaZtGnrGlDU4ElE2IsHlMZQ9CtsD7IDo4YFau7vmcpM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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