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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '015cb0606e6b36563695bbf720c9acddccca95394c4589dc3bdc8470c048ca32' 
  AND token = 'kqeTcpozBfjdOtl1bTlqdczkR+/ECpfXJIcimg6YP5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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