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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa03a37d93e59e488e39b6d862e710ab6ee3c3c2d23acbe7083303db31f81d24' 
  AND token = 'Pnrzfygh58oLIHwoTX0PLM+ZDP1UH80r91z6FztZX0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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