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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b86081a0cae33321ada21fe3f9bf403dd9b73abc4f88d41a45561370cd46c18' 
  AND token = 'zHEjQZmWNLo6UqidlWnmch3RkX7fTvki9KMS5tl8F/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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