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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc71af8c97f6c822b03a5f1cd502b55c0bba06988050121c16dea6febfab5e0e' 
  AND token = '3ALTU4xxso2pgpDbvuluFCGrBakDSMCAhHBwqwJXOHw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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