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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eccefaf24bc692bcb25912c598d389f50bf89e8d11ff69e4d05efa90aec663c8' 
  AND token = '9JtB9cjyqnoMUVbPdp/0D6xxMd8NMzV9D74NJ8QPEpU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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