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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecda2f833c2239c42f32d7da0057912278778a8f0baeb22711d4dd779b61cf5e' 
  AND token = '6YbXOV8nY36VYafFR9esx/kDiv8ZtvPtAO1lxitUBoI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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