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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1825d82cfeb1f02f617af1daf2119979e4c47619184a7cf780d43f3c169eccd' 
  AND token = '/gaSkMWI0oDYSztQvO3fGuSlH5SGEmbsGI+i5PsQXMM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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