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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd146da28ba95aef183829b34270c1083f8a666b2e36875e317091a3d792b276c' 
  AND token = 'PcL9+O0GgtHoD1QcZ8rP6g4+yXiS4INewHARGYr5TjU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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