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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44d41077c1174605a7a3d893f57c73dcc3beefbdfebdf159b3d27fef1f32d253' 
  AND token = 'i2EVsNcmo3vDKv0jFuRkVub22uSM6jxw9NMfaliz+t8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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