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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6e56f55bb62ca1259051a032e7d889e8a07854c327ae27b506a9c1eb62be32d' 
  AND token = 'ElQSKLr9OSNdMmSunyPHwUCAl6LEbqf7kRIPJeO98cU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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