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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a0f35aea950927ff8c3746b72a7674928ad7c8da1c23f4039ef6360907867d8' 
  AND token = 'WmMcpg1FcQsfBA5Q+Gl4ZXGP+9Cu2AXSAGWC+wZ+P+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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