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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fb4aaace8692c68ab89e6bb387668f7987f56ff7b8cc5a8bf19a2ea88fff677' 
  AND token = 'aKdFxPmV3gElgNci5PLG4q0Dll2yQEtTXUMAFwDhkb4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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