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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55f3d0b4bd25be7d65b75fa9f18b88d51edbc6a53d5e545669500a6753c20d52' 
  AND token = 'lbn9rOir8ZyY6iGQP+5hyqk/x20cYaEKTCsWedI7hFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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