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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b34e9b9e51004162f5347c5222eeb5e5f98a516a8ef833515e1f7d7f70f80db' 
  AND token = '5cL08lFK6MN1R9a3QSVZ1kSVxpQQJJzNXPUfiFuSzsU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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