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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da9f27cd43adacc9a7a7b01c1ab8d815435580d3a717e91b114192e9f642d128' 
  AND token = 'WscZifLM7tkdgKk97f9pMvEt5TMMTuNrhquixNK7O08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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