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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2879d429e299d4c3e18641e1fa9f1dd26d381a2247c6c9de86f02c9ef8ed9128' 
  AND token = '7XwUosNDJDFiftt9bBP5Jn48lmN5ZUvAwtQZc7yE/nY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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