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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98b1321f970cedb8a20b8b13d15af5027a0aa6897ed77d2a6bf2e8fd639dfc0c' 
  AND token = 'xSL30/j2Kv3d+a1ByOsf/SInVll1XmeRBzD2IzQe0mc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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