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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cafa68ac167fe20fe6cb8557c5a66015f916a1d39ecb733861baafd0d020f2c' 
  AND token = 'Hmbtgb7GMeh0cpWqNXUIFJkk8koSGR/nRPHut3ZvM/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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