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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '290681b2fda03d9130e4499b4eca530c3dac3f79c1f0ffac9d04f3742c50baef' 
  AND token = 'ZdN4tcUS2awKI6qEYo6/CWAfVH0ViksB0xzg2DOJI3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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