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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c438e921dd13715eb4375f103f4705fdf9fc6cb96df0071623c4b8ca1b0bc875' 
  AND token = 'XvlYz5LGM4llBZff2a/TOUM6GuB1vrX6/AU4wqar/bs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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