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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f2fa725bfe47c9a09cfec0b6c37ac31116622c2120b3ddf9391e07e90f0b447' 
  AND token = 'Cb6XILxNGJzCtXQqAtnv6Lph357APNOPeYbxWAS9h1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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